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000221_news@columbia.edu_Mon Apr 24 23:28:49 1995.msg
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(5.65c+CU/IDA-1.4.4/HLK for <kermit.misc@watsun.cc.columbia.edu>); Mon, 24 Apr 1995 19:28:57 -0400
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: HELP!..Optimum EXE trnsf setting & using .ksd file
Date: 24 Apr 1995 23:28:49 GMT
Organization: Columbia University
Lines: 75
Message-Id: <3nhc7h$h2b@apakabar.cc.columbia.edu>
References: <3ngv4i$fn9@homer.alpha.net>
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Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <3ngv4i$fn9@homer.alpha.net>, Anil Raman <raman@mfa.com> wrote:
>1) EXE file transfer between VAX sustems on a 9600 baud noisy phone line
> using C-Kermit 5A(190):
>
>Settings tried so far:
> win = 1 - 30
> block = 2 - 3
> time send/rec = 20 - 92
> type = bin/image fixed
> speed = 9600
> packet send/rec = 1000 - 5000
> remote mode = server
>
>Result: Times out, too many retries or takes too long.
> Tried the recommended settings in "Truth about kermit..." did not get the
> efficiency obtained in the benchmarks..(maybe because they weren't run on
> a VAX m/c).
>
You are on the right track, but it simply can't be emphasized enough:
EVERY CONNECTION HAS ITS OWN CHARACTERISTICS
or:
NO TWO CONNECTIONS HAVE THE SAME OPTIMUM SETTINGS
If I really, really wanted to find the absolute optimum settings for a
particular connection, I would perform a two-dimensional binary search on
a matrix of window size vs packet size -- a time-consuming process.
And then, having obtained the optimum window/packet combination, I'd add in
control-character unprefixing -- but, again, homing in on the largest
set of control character that can be unprefixed without causing trouble is
a time-consuming process.
The fact that you have a noisy connection, however, narrows down the
possbilities -- you really don't want to use very long packets when the
connection is noisy, because:
. The longer a packet, the greater the chance it will be struck
by noise.
. The longer a packet, the longer it takes to retransmit.
Also, since the line is noisy:
. Use SET BLOCK 3.
. Increase the retry limit if necessary.
You will not get optimimum performance on a noisy line, no matter what
protocol you use.
>2) Error msg: Services directory not available.
> while trying to access XXXX from ckermit.ksd file of following format:
>
> XXXX vmslogin mfa93; call microcom LTA5401 9600 9,796-1087
>
> Should I edit *.kdd too?
>
No, that message simply means it can't find your CKERMIT.KSD file. It should
go in your login directory.
>3) Would like to be able to use the arrow keys and map/code commands/macros
> as key functions.
> ex: 'F4' <==> atdt ########## etc.
>
What version of Kermit are you talking about? On what computer? Is this
VMS again? If so, the answer is, sorry, no, you can't access F-keys from
C-Kermit's SET KEY command. The operating system hides them from Kermit.
If you are using MS-DOS Kermit or OS/2 C-Kermit, the answer is yes -- use
SET KEY for this.
- Frank